[Gnash-commit] [bug #45722] Gnash emitted loud screech after playing PCM audio object

[Nutchanon Wetchasit]

Follow-up Comment #25, bug #45722 (project gnash):

Please note that Gnash with FFmpeg/libAV backend is still *not playing 8-bit
PCM (and 8-bit raw PCM) properly*.
(Submitted patches fixes only _GStreamer_ backend)

These are summary of result on current Gnash playing test files:

* FFmpeg/libAV backend:
** `pcmplay.swf`: played OK
** `pcmplay-stereo.swf`: played OK
** `pcmplay-8bit.swf: *played with weird wail followed*
** `pcmplay-stereo-8bit.swf`: *aborted, or crashed*
** `rawpcmplayle.swf`: played OK
** `rawpcmplayle-stereo.swf`: played OK
** `rawpcmplay-8bit.swf`: *played with weird wail followed*
** `rawpcmplay-stereo-8bit.swf`: *aborted, or crashed*
* GStreamer backend:
** `pcmplay.swf`: played OK
** `pcmplay-stereo.swf`: played OK
** `pcmplay-8bit.swf: played OK
** `pcmplay-stereo-8bit.swf`: played OK
** `rawpcmplayle.swf`: played OK
** `rawpcmplayle-stereo.swf`: played OK
** `rawpcmplay-8bit.swf`: played OK
** `rawpcmplay-stereo-8bit.swf`: played OK

For GDB backtraces on FFmpeg 8-bit stereo (uncompressed PCM) case, see the
previously attached `pcmplay-8bit_gnash0.8.11dev-775c5fe_diagnostic.zip`.

I think that crashes/aborts on _uncompressed_ 8-bit stereo sound and
_raw_ 8-bit stereo sound are the same, as they were handled by the same
decoder (AV_CODEC_ID_PCM_S8)
<http://git.savannah.gnu.org/cgit/gnash.git/tree/libmedia/ffmpeg/AudioDecoderFfmpeg.cpp?id=e4c2ac8c39f3c2745651c622075c3ca1a23890f1#n181>.

For the FFmpeg wailing (8-bit mono, both uncompressed and raw), I'm not sure
of the cause.
(The audio dump from uncompressed PCM case is in
`pcmplay-8bit_gnash0.8.11dev-775c5fe_diagnostic.zip`)

Gnash: 0.8.11dev (git e4c2ac8 14-Sep-2015)
SDL: libsdl1.2debian 1.2.15-5 (debian)
libAV: libavcodec53 6:0.8.17-1 (debian), libavformat53 6:0.8.17-1 (debian),
libavutil51 6:0.8.17-1 (debian)
GStreamer: libgstreamer0.10-0 0.10.36-1.2 (debian)
CSound: libcsound64-5.2 1:5.17.11~dfsg-3 (debian)
System: Debian GNU/Linux 7.0 Wheezy i386

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